title: Inhibition of NF-kappaB and HIV-1 long terminal repeat transcriptional activation by inducible nitric oxide synthase 2 activity.
abstract: In the human lymphoblastoid T cell line JJhan-5.1, stably transfected with a human immunodeficiency virus-1 long terminal repeat luciferase vector, the level of luciferase activity is dependent on activation of the nuclear factor kappaB (NF-kappaB) transcription factor. Tumor necrosis factor-induced luciferase activity was not modified in JJhan-5.1 cells co-cultivated with murine adenocarcinoma EMT-6 cells but was strongly decreased when nitric oxide (NO) synthase 2 expression was induced in these cells. Two NO synthase inhibitors counteracted this inhibitory effect. Tumor necrosis factor-alpha binding to JJhan-5.1 cells was not modified after incubation with EMT-6 cells. Viability and protein synthesis in JJhan-5.1 cells were also unchanged. Induction of NF-kappaB DNA binding activity was inhibited when EMT-6 cells expressed NO synthase 2 activity. Aminoguanidine, which completely abolished nitrite production, prevented this inhibition. NF-kappaB activation was also strongly inhibited by S-nitrosoglutathione but was marginally affected by N-(2-aminoethyl)-N-(2-hydroxy-2-nitrosohydrazino)-1, 2-ethylenediamine. Taken together, these results indicated that NO-related species, released by EMT-6 effector cells and probably different from NO itself, inhibited NF-kappaB activation in human lymphoblastoid target cells. Consequently, transcriptional activity of a long terminal repeat-driven luciferase gene construct was markedly diminished.
authors.affiliation: Unité 571 du CNRS, Bâtiment 430, Université Paris-Sud, F-91405 Orsay Cedex, France.
authors.forename: D
authors.initials: D
authors.lastname: Sekkaï
authors.forename: F
authors.initials: F
authors.lastname: Aillet
authors.forename: N
authors.initials: N
authors.lastname: Israël
authors.forename: M
authors.initials: M
authors.lastname: Lepoivre
mesh_terms: D000818:Animals; D018920:Coculture Techniques; D005978:Glutathione / Q000031:analogs & derivatives / Q000494:pharmacology; D006146:Guanidines / Q000494:pharmacology; D016325:HIV Long Terminal Repeat / Q000235:genetics*; D006801:Humans; D008156:Luciferases / Q000235:genetics / Q000378:metabolism; D051379:Mice; D016328:NF-kappa B / Q000037:antagonists & inhibitors / Q000378:metabolism*; D019331:NG-Nitroarginine Methyl Ester / Q000494:pharmacology; D009569:Nitric Oxide / Q000494:pharmacology; D019001:Nitric Oxide Synthase / Q000037:antagonists & inhibitors / Q000378:metabolism*; D052247:Nitric Oxide Synthase Type II; D009603:Nitroso Compounds / Q000494:pharmacology; D026422:S-Nitrosoglutathione; D014157:Transcription Factors / Q000378:metabolism; D015533:Transcriptional Activation / Q000235:genetics*; D014226:Triazenes / Q000494:pharmacology; D014407:Tumor Cells, Cultured; D014409:Tumor Necrosis Factor-alpha / Q000037:antagonists & inhibitors / Q000378:metabolism
chemical_list: C105351:1-hydroxy-2-oxo-3,3-bis(2-aminoethyl)-1-triazene; D006146:Guanidines; D016328:NF-kappa B; D009603:Nitroso Compounds; D014157:Transcription Factors; D014226:Triazenes; D014409:Tumor Necrosis Factor-alpha; D009569:Nitric Oxide; D026422:S-Nitrosoglutathione; D008156:Luciferases; C496319:NOS2 protein, human; D019001:Nitric Oxide Synthase; D052247:Nitric Oxide Synthase Type II; C496317:Nos2 protein, mouse; D005978:Glutathione; C004479:pimagedine; D019331:NG-Nitroarginine Methyl Ester